figure2.eps
Fig.2. The reconstructed mmu+ mu- gamma distribution after final cuts. The large peak centered at 380 MeV/c2 is from KL-> pi+ pi- pi0. Kmu3 dominates the background from ~400 MeV/c2 out to 600 MeV/c2 with a slight enhancement at 450 MeV/c2 from Kmu3 gamma.
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figure3.eps
The dimuon mass distributions for data and for Monte Carlo with no form factor (top). The data/Monte Carlo ratio is a direct measurement of the form factor (bottom). The Monte Carlo is normalized to the total number of data events.
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